220631 has 8 divisors (see below), whose sum is σ = 232560. Its totient is φ = 209088.

The previous prime is 220613. The next prime is 220663. The reversal of 220631 is 136022.

220631 is nontrivially palindromic in base 4.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220631 - 2¹⁰ = 219607 is a prime.

It is a super-2 number, since 2×220631² = 97356076322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2435 + ... + 2523.

It is an arithmetic number, because the mean of its divisors is an integer number (29070).

2²²⁰⁶³¹ is an apocalyptic number.

220631 is a deficient number, since it is larger than the sum of its proper divisors (11929).

220631 is an equidigital number, since it uses as much as digits as its factorization.

220631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 220631 is about 469.7137426135. The cubic root of 220631 is about 60.4257678455.

Adding to 220631 its reverse (136022), we get a palindrome (356653).

It can be divided in two parts, 2206 and 31, that multiplied together give a palindrome (68386).

The spelling of 220631 in words is "two hundred twenty thousand, six hundred thirty-one".